Video text to S4 from iPhone plays as a mini video

My daughter sends videos of my grandchildren via text message from her iPhone. When they play on my Samsung S4 they are miniature videos about the size of my little fingernail. They play fine on my husband's iPhone. Does anyone have a solution so I can actually view them full screen size? Thank you.

I've had this happen many times. I have my phone setup so that if I tap the screen 3 times it will enlarge the screen. It works for these videos very well. You need to use 2 fingers to drag things around instead of one. You expand and contract the size of the screen the same way with opening and closing a pinch.